JP2010255701A - Clamp joint for piping - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clamp joint for piping, for providing a sufficient fastening force, while performing the connection and a release through simple operation. <P>SOLUTION: Mutual lower ends of a pair of clamp bands 6a and 6b divided into two parts so as to form a substantially semicircular shape forming a recessed groove capable of covering the outer periphery of a butting part of mutual ferrules, are rotatably connected via a connecting fitting 7. A pair of fastening parts 9a and 9b are formed by upwardly bending the free end side of the pair of clamp bands so as to mutually maintain a parallel state. Link plates 11 and 11 are rotatably installed on both sides of the fastening part 9a via a pin 10, and an operation lever 13 forming a cam 14 in a base end via a pin 12, is rotatably attached to a tip of the pair of link plates. A cam receiving recessed part 16 with which the cam 14 is brought into pressure contact, is recessed in the fastening part 9b. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a clamp joint used when connecting ferrules of pipes through which various powders, liquids or gases flow.

  Conventionally, in the field of synthetic resin molding technology, for example, in order to remove magnetic metal powder such as iron powder mixed in a raw material resin compound for molding in a stage prior to injection into an injection molding machine or the like, the raw material resin is supplied by pneumatic transportation. A rod-shaped magnet having a strong magnetizing force is detachably attached in a piping path that attracts the magnet to the molding machine so as to separate and remove the magnetic metal powder in the raw material resin.

  Since magnetic metal powder adheres to the outer periphery of the magnet in the piping path with time, the operation is stopped at regular intervals, the pipe connection at the ferrule part is released, and the magnet bar is removed from the piping system. Need to be cleaned. In such pipe connection and release, a clamp joint as shown in Patent Document 1 is generally used.

Japanese Patent Laid-Open No. 2-11992

  In the conventional clamp joint shown in FIG. 5 of the above-mentioned Patent Document 1, grooves 1a and 2a having trapezoidal cross sections are formed inside two metal fastening members 1 and 2 formed in a semicircular shape. The fastening members 1 and 2 are pivotally connected via a connecting member 3 at one end.

  Further, a fastening mechanism 4 is provided at the other end of these fastening members 1 and 2, and this fastening mechanism 4 is provided on one of the fastening members 1 and 2, for example, the fastening member 1. A bolt 4b rotatably supported by the supported support shaft 4a, a wing nut 4c screwed to the bolt 4b, and a locking cut formed on the other fastening member 2 to which the bolt 4b is locked. It is comprised from the notch groove 4d.

  For this reason, in order to release the pipe connection, the wing nut 4c must continue to rotate until it is disengaged from the notch groove 4d for locking, and there is a drawback that it takes time and effort to operate. Also, in order to reconnect after replacement or inspection, the wing nut 4c must be turned in the same manner, which is not quick and prevents leakage of powder and liquid flowing through the pipe. Since the wing nut is tightened tightly, there is a problem that the screw thread is gradually damaged and a sufficient tightening force cannot be obtained. As described above, since the conventional clamp joint uses a part having a thread as a tightening mechanism, there are not a few cases where there is a concern about hygiene in the food processing field.

  Therefore, the present invention eliminates the problems of the above-described conventional clamp joints for piping, enables connection and release with one touch, ensures sufficient tightening force without using screw parts, and also in the food processing field. The object is to provide a clamp joint for piping that can be used with peace of mind.

  If the structure of this invention for achieving the said objective is explained in full detail, the invention which concerns on Claim 1 will insert a gasket in the annular groove recessedly provided in the contact surface of the ferrule formed in the joint of piping. In this way, the ferrules of both pipes are butted against each other, and the ferrules are attached to the outer periphery of the butted portion to prevent the powder, liquid or gas flowing through the pipe from leaking to the outside. The lower ends of a pair of clamp bands bisected so as to form a substantially semicircular shape that can cover the outer periphery of the abutting portion of the butt portion are connected to each other via a connecting fitting so as to be rotatable. The pair of clamp bands are bent upward so that the free end portions of the pair of clamp bands can be kept parallel to each other to form a pair of tightening portions that are U-shaped when viewed from above, and of the pair of tightening portions, A link plate is pivotally attached to both sides of one of the tightening portions via a pin, and an operation lever having a cam portion formed at a base end portion is pivotable to the distal end portion of the pair of link plates via a pin. And a cam receiving recess formed on the base end portion of the operation lever, the cam receiving recess being pressed against the other tightening portion.

  According to the clamp joint for piping of the present invention, an operation lever that is rotatably attached to one tightening portion is gripped, and a frame formed by a pair of link plates is put on the other tightening portion, and then the operation lever is clamped. When turned in the band direction, the cam portion formed at the base end of the operating lever is pressed against the cam receiving recess recessed in the other tightening portion, and the other tightening portion is directed toward one tightening portion. The airtightness and watertightness of the butted portion between the ferrules of the piping can be maintained by being pressed.

  Therefore, the screwing operation of a wing nut or the like is not required as in the prior art, and the operability is greatly improved. In addition, the cam portion provided at the base end portion of the operation lever is structured to fit into the cam receiving recess provided in the other tightening portion, so that it has excellent durability and can withstand repeated use sufficiently. Is. In addition, in the clamp joint of the present invention, since no threaded parts are used, the sanitary property is improved, and it can be used more safely in the food processing field where strict hygiene management is required.

It is a perspective view which shows the use condition of the clamp joint for piping which concerns on this invention. It is sectional drawing which shows the butt | matching part of ferrules of piping. It is explanatory drawing of the state which opened a pair of clamp band. It is explanatory drawing of the state which covered the frame formed by a pair of link board on the other fastening part. It is explanatory drawing of the state which turned the operation lever and press-fitted the cam part in a base end part in a cam receiving recessed part. It is a top view of the state of FIG.

  Hereinafter, one embodiment of a clamp joint for piping of the present invention is described in detail based on a drawing.

  In the figure, 1 indicates a pipe through which various powders, liquids, or gases flow, and 2 indicates a ferrule formed at the joint of the pipe 1. Reference numeral 3 denotes an annular groove recessed on the contact surface of the ferrule 2, and 4 denotes an annular gasket that is fitted into the annular groove 3.

  Reference numeral 5 denotes an entire clamp joint that is tightly attached to the outer periphery of the abutting portion of the pipe 1 between the ferrules 2 and prevents the powder, liquid, or gas flowing through the pipe from leaking to the outside.

  The clamp joint 5 is mainly composed of a pair of clamp bands 6 a and 6 b which are divided into two substantially semicircular shapes, and the lower ends of the clamp bands 6 a and 6 b can be rotated or freely opened and closed via a connecting fitting 7. It is connected to. In the figure, reference numeral 8 denotes a stop pin for connecting the connecting bracket 7 and the lower ends of the clamp bands 6a and 6b.

  The clamp bands 6a and 6b which are bisected so as to form a substantially semicircular shape are formed in a cross-sectional groove shape so as to cover the outer periphery of the abutting portion between the ferrules 2 of the pipe 1, and the clamp bands 6a, The butted portion can be fitted into the groove with 6b open.

  Next, 9a and 9b show a pair of tightening portions formed so that the free end sides of the pair of clamp bands 6a and 6b are bent upwards so as to maintain a parallel state with each other, and are formed so as to be substantially U-shaped when viewed from above. Link plates 11 and 11 are rotatably attached to either one of the pair of tightening portions 9a via pins 10 on both sides of the pair of tightening portions 9a. An operating lever 13 having a cam portion 14 formed at the base end portion via a pin 12 is rotatably attached.

  In addition, it is preferable that spacers 15 and 15 are appropriately attached to the pin shaft 12 on both sides of the operation lever 13 so that the operation lever 13 is held at the center of the pin shaft 12.

  In the figure, reference numeral 16 denotes a cam receiving recess provided in the other tightening portion 9b. The cam receiving portion formed at the base end portion of the operating lever 13 can be press-fitted. Although the illustrated cam receiving recess 16 has a circular shape, the present invention can be sufficiently applied to form a cam receiving recess by forming a concave groove in the lateral direction of the tightening portion 9b.

  The embodiment of the clamp joint for piping according to the present invention will be described with reference to FIGS. 2 to 6. First, in the annular groove 3 formed in the contact surface of the ferrule 2 formed at the joint of the pipe 1 After the gasket 4 is inserted into the ferrule 2, the ferrules 2 are butted together, and then the pair of clamp bands 6 a and 6 b of the clamp joint 5 are opened. Since the lower ends of the clamp bands 6a and 6b are pivotally attached to the connection fitting 7 by the stop pins 8 and 8, the clamp bands 6a and 6b can be easily opened (FIG. 3).

  After fitting the butted portions of the ferrules 2 into the recessed grooves of the opened clamp bands 6a and 6b, the clamp bands 6a and 6b are closed, and the operation lever 13 attached to the tightening portion 9a is grasped to be paired. The frame formed by the link plates 11 and 11 and the pin 12 surrounds the other tightening portion 9b (FIG. 4).

  Next, when the operation lever 13 is rotated downward about the pin shaft 12, the cam portion 14 provided at the base end portion of the operation lever 13 is rotated upward opposite to the movement of the operation lever 13. The tip cam surface of the portion 14 is tightly fitted into the cam receiving recess 16 provided in the tightening portion 9b, and at the same time, the tightening portion 9b is strongly drawn toward the tightening portion 9a and the locked state is maintained (see FIG. 5 and FIG. 5). FIG. 6).

  On the contrary, to release the locked ferrule part, if the operating lever 13 is pushed upward, a downward force is applied to the cam part 14 and the cam surface is disengaged from the cam receiving recess 16 of the tightening part 9b. Since the locked state is released, the clamp band 6a, 6b can be easily moved left and right by grasping the operating lever 13 and releasing the frame formed by the pair of link plates 11, 11 and the pin 12 from the tightening portion 9b. The clamp joint 5 can be removed from the ferrule part.

  Thus, according to the clamp joint for piping of the present invention, the airtightness and watertightness of the butted portions of the ferrules can be maintained with a one-touch operation by simply rotating the operation lever downward, and the conventional Such a screwing operation becomes unnecessary, and the workability is greatly improved. In addition, the cam portion provided at the base end portion of the operation lever is structured to fit into the cam receiving recess provided in the other tightening portion, so that it has excellent durability and can withstand repeated use sufficiently. Is. In addition, the clamp joint of the present invention does not use any part having a screw portion, so that it has good sanitary properties and is suitable for pipe connection in the food processing field.

  The clamp joint for piping of the present invention can be applied not only to the field of synthetic resin molding as described above, but also to various fields in which piping is used in the manufacturing process, such as the field of food manufacturing and processing, the field of drug manufacturing, and the like.

1: Piping 2: Ferrule 3: Annular groove 4: Gasket 5: Clamp joint 6a: Clamp band 6b: Clamp band 7: Connecting bracket 8: Stop pin 9a: Tightening portion 9b: Tightening portion 10: Pin 11: Link plate 12: Pin 13: Operation lever 14: Cam portion 15: Spacer 16: Cam receiving recess

Claims (1)

  The ferrules of both pipes are butted together in an annular groove recessed in the contact surface of the ferrule formed at the joint of the pipes, and are tightly attached to the outer periphery of the butted portion. In a clamp joint that prevents leakage of powder particles, liquid, or gas flowing outside, a substantially semicircular shape is formed by forming a concave groove that can cover the outer periphery of the butted portion of the ferrules. The lower ends of the pair of halved clamp bands are connected to each other via a connecting bracket so that the free ends of the pair of clamp bands can be folded upward so as to maintain a parallel state with each other. Forming a pair of tightening portions having a U-shape when viewed from the side, and rotatably attaching a link plate to both sides of either one of the pair of tightening portions via pins; A cam receiving recess in which a cam portion formed at the base end portion of the pair of link plates is pivotally attached to the distal end portion of the pair of link plates via a pin, and the cam portion formed at the base end portion of the operation lever is in pressure contact Is a concave clamp in the other tightening portion.

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